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Tue, 20 Sep 2022 13:29:06 +0000 (UTC) X-FDA: 79932544692.07.6DA8E2F Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by imf26.hostedemail.com (Postfix) with ESMTP id 88385140028 for ; Tue, 20 Sep 2022 13:29:03 +0000 (UTC) Received: from dggpeml500023.china.huawei.com (unknown [172.30.72.56]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4MX2M51rYYzMnDn; Tue, 20 Sep 2022 21:24:17 +0800 (CST) Received: from [10.67.110.112] (10.67.110.112) by dggpeml500023.china.huawei.com (7.185.36.114) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 20 Sep 2022 21:28:58 +0800 Subject: Re: [PATCH] mm/secretmem: remove reduntant return value To: David Hildenbrand , CC: , , Binyi Han References: <20220920012205.246217-1-xiujianfeng@huawei.com> <3196b824-bcee-0c44-bfd3-f6cd8a1e6719@redhat.com> <7f1cfee4-c6de-ea59-0aa9-9bd55054fb22@redhat.com> From: xiujianfeng Message-ID: <0761fca9-b9f0-f3d7-0bf2-e73089db9d84@huawei.com> Date: Tue, 20 Sep 2022 21:28:57 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: <7f1cfee4-c6de-ea59-0aa9-9bd55054fb22@redhat.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.67.110.112] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpeml500023.china.huawei.com (7.185.36.114) X-CFilter-Loop: Reflected ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663680545; a=rsa-sha256; cv=none; b=AavAr81aTaZS+FF9umwXzFcru4IhKa6EO6rD5eyGh7ePJHsQ60Suovewr4fNIWcIPY6Uwv Gh9tHt4npMbZCj7gMR6XLhrupnvhK01nM7SJNlFjXzk/Upk6ZxnK8Nb2Iisntz1RAyq+Wx 5W2kalZKTNgnWAP7rF1x1G0o4ZzT4/Q= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf26.hostedemail.com: domain of xiujianfeng@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=xiujianfeng@huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663680545; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gAfYXHFaz/w2EqmoWMGElGUSW8vZsgqAxVjvstV5RW8=; b=PBwqUKnvPNCz7MnXXwA8BQba+eJGwEojdhOOHuPTo4qF5UcVxSTVZDbsxtfMw0qW/XOtF+ cEWiABvY1Pv3E4Uqd5xALcJM1VgyEGyu+uDnEdvxewWSxdiH7qWNvk6+vrmFGoFhkrikVU 3XBoEgvD1Emnn6CAgRpUkYG+dL9g6V0= Authentication-Results: imf26.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf26.hostedemail.com: domain of xiujianfeng@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=xiujianfeng@huawei.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: joj1bmqhsa9yyr1fn5uezhqzjrcfja3u X-Rspamd-Queue-Id: 88385140028 X-HE-Tag: 1663680543-465163 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, 在 2022/9/20 21:22, David Hildenbrand 写道: > On 20.09.22 14:35, xiujianfeng wrote: >> Hi, >> >> 在 2022/9/20 20:10, David Hildenbrand 写道: >>> On 20.09.22 03:22, Xiu Jianfeng wrote: >>>> The return value @ret is always 0, so remove it and return 0 directly. >>>> >>>> Signed-off-by: Xiu Jianfeng >>>> --- >>>>    mm/secretmem.c | 6 ++---- >>>>    1 file changed, 2 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/mm/secretmem.c b/mm/secretmem.c >>>> index 6a44efb673b2..04c3ac9448a1 100644 >>>> --- a/mm/secretmem.c >>>> +++ b/mm/secretmem.c >>>> @@ -278,10 +278,8 @@ static struct file_system_type secretmem_fs = { >>>>    static int __init secretmem_init(void) >>>>    { >>>> -    int ret = 0; >>>> - >>>>        if (!secretmem_enable) >>>> -        return ret; >>>> +        return 0; >>>>        secretmem_mnt = kern_mount(&secretmem_fs); >>>>        if (IS_ERR(secretmem_mnt)) >>> >>> On top of which tree is that? >>> >>> 6.0-rc6 has here: >>> >>> if (IS_ERR(secretmem_mnt)) >>>       ret = PTR_ERR(secretmem_mnt); >>> >> Sorry, it's on linux-next tree, I should have used [PATCH -next]:) >> > > Maybe this change should be squashed into the patch from Binyi directly: > Looks good to me, thanks. > > commit 4eb5bbde3ccb710d3b85bfb13466612e56393369 (mm/mm-hotfixes-stable) > Author: Binyi Han > Date:   Sun Sep 4 00:46:47 2022 -0700 > >    mm: fix dereferencing possible ERR_PTR >    Smatch checker complains that 'secretmem_mnt' dereferencing possible >    ERR_PTR().  Let the function return if 'secretmem_mnt' is ERR_PTR, to >    avoid deferencing it. >    Link: https://lkml.kernel.org/r/20220904074647.GA64291@cloud-MacBookPro >    Fixes: 1507f51255c9f ("mm: introduce memfd_secret system call to > create "secret" memory areas") >    Signed-off-by: Binyi Han >    Reviewed-by: Andrew Morton >    Cc: Mike Rapoport >    Cc: Ammar Faizi >    Cc: Hagen Paul Pfeifer >    Cc: James Bottomley >    Cc: >    Signed-off-by: Andrew Morton > >